Remove adoption-site duplicate and .github/skills, gitignore .playwright-mcp

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: GeekTrainer

.gitignore

@@ -42,6 +42,7 @@ htmlcov/
 # playwright
 app/client/test-results/
 app/client/playwright-report/
+.playwright-mcp/
 
 # e2e test database
 app/server/e2e_test_dogshelter.db